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An elderly man has become the first person in the world to receive an injection of stem cells after a stroke, in an attempt to rebuild lost brain connections and tissue. Up to 12 people will be given progressively higher doses over the next year in trial run by a team from the University of Glasgow and stem cell firm ReNeuron, both in the UK.

Keep your diseases

An expedition planned by London's Natural History Museum was postponed this week after Ayoreo Indians in the remote Chaco forest region of Paraguay demanded further consultation with the Paraguayan government. They are concerned that the researchers will spread diseases to their isolated populations.

A nose for food

Overweight people have a heightened sense of smell for food. Psychologists also found volunteers, irrespective of weight, were better at sniffing out food after a meal than before one (Chemical Senses, ...

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